BIOL 1082 Lecture Notes - Water Potential, Phloem, Phylogenetic Tree
Biology Review
JanuraRY 30TH- Feb 20th up to #6
• Draw an angiosperm (extended response)
o Identify location and function
o Complete flower- sepals, pedals, carpal, and carpal contains the stigma which
has anthers and filaments, style, ovaries, and within ovaries the oval.
▪ Feb 13 power point #15
• Know green algae, bryophytes, ferns, gymnosperms, and angiosperms
• Shared derived traits for evolution of plants so look at phylogenetic tree.
o Feb 15th power point # 42-43
• Transpiration
o Ideal conditions good sunlight, and the atmosphere has moisture
o Stomata is open by having guard cells open them by having a influx of chlorine
and potassium.
o Water comes through osmosis
o Proton gradient is what gives the cell energy
o Phloem is active transport
• Properties of water
o Cohesion water can be attracted to one another (partial negative and positive)
o Adhesion allows the water to be attached to the xylem walls
• Tonicity (osmosis)
o Water potential= pressure potential+ solute potential
o Water moves from high water potential to low water potential
o Water moves away from area of high pressure
o Water follows solute
o Solute potential of pure water is equal to zero
o All other solute will have a negative solute potential
o Low mpa at the roots and soil higher as it goes up the plant
▪ Slide 37 Feb
• Describe the mechanism behind phloem transport
o Feb 13th slide #5
o Companion cell has nucleus and breaks down sugars
o Once cells reach maturity they are no longer living but they still have a function.
o Once water enters the broken-down sugar it than becomes passive transport.
o High to low for water
o In xylem it is from low to high which is why it is passive transport
• Remember the companion cell and sieve tube that makes up the phloem
• Three different ground tissues
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